Fluke 2680 User Manual

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2680A/2686A

Data Acquisition System/Data Logging System

June 2002, Rev. 1, 4/04

Users Manual

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Limited Warranty and Limitation of Liability

Each Fluke product is warranted to be free from defects in material and workmanship under normal use and service. The warranty period is one year and begins on the date of shipment. Parts, product repairs and services are warranted for 90 days. This warranty extends only to the original buyer or end-user customer of a Fluke authorized reseller, and doe s not appl y to fuses, di spo sab le batteries or to any product which, in Fluke's opinion, has been misused, altered, neglected, contaminated, or damaged by accident or abnormal condit ion s of operatio n or handling .

Fluke warrants that software will operate substantially in accordance with its functional specifications for 90 days and that it has been properly recorded on non-defective media. Fluke does not warrant that software will be error free or operate without interruption. The software is neither intended nor warranted for use in medical or any other applications where human safety may be a concern.

Fluke authorized resellers shall extend this warranty on new and unused products to end-user customers only but have no authority to extend a greater or different warranty on behalf of Fluke. Warranty support is available only if product is purchased through a Fluke authorized sales outlet or Buyer has paid the applicable international price. Fluke reserves the right to invoice Buyer for importation costs of repair/replacement parts when product purchased in one country is submitted for repair in another country.

Fluke's warranty obligation is limited, at Fluke's option, to refund of the purchase price, free of charge repair, or replacement of a defective product which is returned to a Fluke authorized service center within the warranty period.

To obtain warranty service, contact your nearest Fluke authorized service center to obtain return authorization information, then send the product to that service center, with a description of the difficulty, postage and insurance prepaid (FOB Destination). Fluke assumes no risk for damage in transit. Following warranty repair, the product will be returned to Buyer, transportation prepaid (FOB Destination). If Fluke determines that failure was caused by neglect, misuse, contamination, alteration, accident or abnormal condition of operation or handling, including over vo ltage failures caused by use outside the product’s specified rating, or normal wear and tear of mechanical components, Fluke will provide an estimate of repair costs and obtain authorization before commencing the work. Following repair, the product will be returned to the Buyer transportation prepaid and the Buyer will be billed for the repair and return transportation charges (FOB Shipping Point).

THIS WARRANTY IS BUYER'S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. FLUKE SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES AND/OR PROFITS, INCLUDING LOSS OF DATA, ARISING FROM ANY CAUSE OR THEORY.

Since some countries or states do not allow limitation of the term of an implied warranty, or exclusion or limitation of incidental or consequential damages, the limitations and exclusions of this warranty may not apply to every buyer. If any provision of this Warranty is held invalid or unenforceable by a court or other decision-maker of competent jurisdiction, such holding will not affect the validity or enforceability of any other provision.

Fluke Corporation Fluke Europe B.V. P.O. Box 9090 P.O. Box 1186 Everett, WA 98206-9090 5602 BD Eindhoven

U.S.A. The Netherlands

2/02

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XWCaution

This is an IEC safety Class 1 product. Before using, the ground wire in the line cord or rear panel binding post must be connect to an earth ground for safety.

Interference Information

This equipment generates and uses radio frequency energy and if not installed and used in strict accordance with the manufacturer’s instructions, may cause interference to radio and television reception. It has been type tested and found to comply with the limits for a Class B computing device in accordance with the specifications of Part 15 of FCC Rules, which are designed to provide reasonable protection against such interference in a residential installation.

Operation is subject to the following two conditions:

• This device may not cause harmful interfere nce .

• This device must accept any interference received, including interference that may cause

undesired operation.

There is no guarantee that interference will not occur in a particular installation. If this equipment does cause interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one of more of the following measures:

• Reorient the receiving antenna

• Relocate the equipment with respect to the receiver

• Move the equipment away from the receiver

• Plug the equipment into a different outlet so that the computer and receiver are on different

branch circuits

If necessary, the user should consult the dealer or an experienced radio/television technician for additional suggestions. The user may find the following booklet prepared by the Federal Communications Commission helpful: How to Identify and Resolve Radio-TV Interference Problems. This booklet is available from the U.S. Government Printing Office, Washington, D.C. 20402. Stock No. 004-000-00345-4.

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SAFETY TERMS IN THIS MANUAL

This device has been designed and tested to meet the requirements of EN61010-1 (Safety Requirements for Electrical Equipment for Measurement, Control and Laboratory Use). It is an Installation Category II device intended for operation from a normal single phase supply. The DIO relay controls are rated to 250 V ac CAT I and should not be used in applications that exceed that rating. contains information, warnings and cautions. Use of this equipment in a manner not specified herein may impair the protection provided by the equipment.

Measurement category I is for measurements performed on circuits not directly connected to MAINS. Examples are measurements on circuits not derived from MAINS, and specially protected (internal) MAINS derived circuits.

Measurement category II is for measurements performed on circuits directly connected to the low voltage installation. Examples are measurements on household appliances, portable tools and similar equipment.

XWWARNING statements identify conditions or practices that could result in personal injury or loss of life.

XWCAUTION statements identify conditions or practices that could result in damage to equipment.

SYMBOLS MARKED ON EQUIPMENT:

This Users Manual

X WARNING Risk of electric shock.

J Ground (earth) terminal.

AC POWER SOURCE

The device is intended to operate from an ac power source that will not apply more than 264 V ac rms between the supply conductors or between either supply conductor and ground. A protective ground connection by way of the grounding conductor in the power cord is required for safe operation.

Protective ground (earth) terminal. Must be connected to safety earth ground when the power cord is used.

Attention. Refer to the manual. This symbol indicates that information about usage of a feature is contained in the manual. This symbol appears on the Universal Input Module and in the following two places on the device rear panel:

1. Ground Binding Post (to the left of the line power connector).

2. Alarm/Trigger I/O and Digital I/O connectors.

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XWWARNING

Use the proper fuse. To avoid fire hazard, for fuse replacement use only a 1/2 ampere, 250 V time delay line fuse.

DC POWER SOURCE

The device may also be operated from a 9 V to 45 V dc power source when either the rear panel ground binding post or the power cord grounding conductor is connected properly. The input is protected by a 4 ampere fuse internal to the device. This fuse should only be replaced by a qualified Fluke technician.

GROUNDING THE DEVICE

The device utilizes controlled overvoltage techniques that require the device to be grounded whenever normal mode or common mode ac voltages or transient voltages may occur. The enclosure must be grounded through the grounding conductor of the power cord, or if operated on battery with the power cord unplugged, through the rear panel ground binding post.

USE THE PROPER POWER CORD

Use only the power cord and connector appropriate for the voltage and plug configuration in your country.

Use only a power cord that is in good condition. Refer power cord and connector changes to qualified service personnel.

XWWARNING

To avoid possible electric shock or damage to the device:

• Read manual before operating.

• Do not position device so that air flow through side

vents is restricted.

• Do not use in a manner not specified in this manual or safety protection may be impaired.

• Disconnect power cord and ALL other inputs before replacing a fuse.

• Position the device where power cord can be disconnected.

• Do not exceed maximum voltages.

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XWWARNING

• Do not operate in explosive atmospheres.

• To avoid personal injury or death, do not remove the

device cover without first removing the power source connected to the rear panel. Do not operate the device without the cover properly installed. There is no need for the operator to remove the cover.

• Do not attempt to operate if protection may be impaired.

• If the device appears damaged or operates abnormally, protection may be impaired. Do not attempt to operate the device under these conditions. Refer all question of proper device operation to qualified service personnel.

• Do not attempt to service unless you are a Fluke qualified repair technician.

• To avoid personal injury or death, remove the AC power cord and all analog and digital connector modules before servicing the device.

Note

All signals must be removed from the analog and digital connector wiring before opening the connector modules.

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The following table provides additional safety information.

General Specifications

Specification Characteristic

Size 473 mm (18.6 in) x 432 mm (17 in) x 237 mm (9.3 in) Weight 2680A/2686A (empty) 8.6 Kg (18.9 lb)

2680A – FAI 0.8 Kg (1.8 lb) 2680A – PAI 1.2 Kg (2.7 lb) 2680A – DIO 0.8 Kg (1.8 lb)

Power 100 – 240 V ac (no switching required), 50 to 60 Hz, 100 VA

maximum or optional 9 V d c to 45 V dc, 35 W maximum

EMC EN50082-2

EN55022-1 EN55011 class A EN610000-4-2,3,4,6,8 EN61326

Safety EN61010-1, CAT II

CSA C22.2 No. 1010.1

Operating Temperature

-20 oC to 60 oC (-4 oF to +140 oF)

Range Storage Temperature

-40 oC to 70 oC (-40 oF to +158 oF)

Range Relative Humidity 90% maximum for -10 oC to 28 oC (14 oF to +82 oF)

75% maximum for 28 50% maximum for 35

C to 35 oC (82 oF to +95 oF)

C to 60 oC (95 oF to +140 oF) (3 MΩ range, reduce humidity rating by 25% for 1 hour warm-up. 3 MΩ range meets full humidity ratings with 2 hour warm-up)

Altitude Operating: 2,000 m (6,562 ft) maximum

Non-operating: 12,200 m (40,000 ft) maximum

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Chapter Title Page

1 Overview........................................................................................... 1-1

Introduction...................................................................................................... 1-3

Contacting Fluke.............................................................................................. 1-3

Instrument Features and Capabilities............................................................... 1-5

Mainframe Features................................................................................... 1-8

Trigger Input......................................................................................... 1-8

Trigger Output ...................................................................................... 1-8

PC Card ATA Interface (2686A Only)................................................. 1-8

Master Alarm ........................................................................................ 1-9

Interval Trigger..................................................................................... 1-9

External Trigger.................................................................................... 1-9

Alarms................................................................................................... 1-9

Channel Monitoring.............................................................................. 1-10

Alarm Trigger ....................................................................................... 1-10

Channel Numbering .................................................................................. 1-10

Computed Channels .................................................................................. 1-11

Mx+B Scaling ........................................................................................... 1-11

Analog Channels ....................................................................................... 1-11

Digital I/O Module Option........................................................................ 1-12

Digital I/O............................................................................................. 1-12

Relay Output......................................................................................... 1-12

Totalizer................................................................................................ 1-12

User Interface................................................................................................... 1-13

Operating a 2680 Series Data Acquisition System.......................................... 1-14

Isolated Networks...................................................................................... 1-14

General Networks...................................................................................... 1-14

Ethernet Port.............................................................................................. 1-14

Group Operations...................................................................................... 1-15

Scanning and Logging............................................................................... 1-15

RS-232 Interface ....................................................................................... 1-17

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2680A/2686A

Users Manual

Host Computer Requirements......................................................................... 1-17

Options and Accessories ................................................................................. 1-18

2 Preparing for Operation................................................................... 2-1

Introduction..................................................................................................... 2-3

Instrument Preparation.................................................................................... 2-4

Unpacking and Inspecting the Instrument ................................................ 2-5

Positioning and Rack Mounting ............................................................... 2-5

Connecting to a Power Source and Grounding......................................... 2-5

Operating Using AC Power.................................................................. 2-6

Operating Using DC Power.................................................................. 2-7

Grounding and Common Mode Voltage.............................................. 2-7

Alarm/Trigger I/O Connection ................................................................. 2-7

Trigger Input......................................................................................... 2-8

Trigger Output...................................................................................... 2-9

Master Alarm........................................................................................ 2-10

External Trigger Wiring for a Group........................................................ 2-10

Universal Input Module Analog Connections (2620A-180)..................... 2-12

Shielded Wiring.................................................................................... 2-15

Crosstalk Considerations...................................................................... 2-15

Digital I/O Connector Module.................................................................. 2-15

Digital I/O............................................................................................. 2-16

Totalizer................................................................................................ 2-16

Totalizer Enable ................................................................................... 2-17

Relays ................................................................................................... 2-17

Controls and Indicators............................................................................. 2-17

Front Panel Controls............................................................................. 2-17

Front Panel Indicators .......................................................................... 2-19

Rear Panel Controls.............................................................................. 2-22

Rear Panel Indicators............................................................................ 2-23

Front Panel Operating Procedures ............................................................ 2-24

Power-On Options................................................................................ 2-24

Displaying a Monitor Channel ............................................................. 2-25

Displaying the Digital I/O Status ......................................................... 2-27

Displaying Relay Status ....................................................................... 2-28

Displaying the Totalizer Status ............................................................ 2-30

Reviewing and Setting the Base Channel Number............................... 2-31

Reviewing and Setting the Line Frequency.......................................... 2-33

Reviewing and Setting the Network Type............................................ 2-35

Reviewing and Setting the General Network Socket Port.................... 2-40

Reviewing and Setting the General Network IP Address..................... 2-41

Reviewing and Setting the Subnet Mask and Default Gateway........... 2-42

Viewing the Instrument Ethernet Address ........................................... 2-44

Reviewing and Setting PC Card Options ............................................. 2-46

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Contents

(continued)

Host Computer and Network Preparation........................................................ 2-47

Installing Host Computer Ethernet Adapter.............................................. 2-47

Instrument and Host Computer Interconnection ....................................... 2-49

Host Computer/Instrument Direct Connection ..................................... 2-49

Interconnection Using 10/100BaseT (Twisted Pair) Ethernet Wiring.. 2-50

Set Up Windows Networking ................................................................... 2-52

Setting Host Computer Networking Parameters ....................................... 2-53

Installing Fluke DAQ Software................................................................. 2-53

Testing and Troubleshooting ........................................................................... 2-54

Installing and Testing the Installation ....................................................... 2-54

Troubleshooting Network Problems ......................................................... 2-58

3 Using Fluke DAQ Software .............................................................. 3-1

Introduction...................................................................................................... 3-3

Installing Fluke DAQ Software ....................................................................... 3-4

Understanding the User Interface .................................................................... 3-5

Fluke DAQ Main Window........................................................................ 3-5

Using the Toolbar...................................................................................... 3-6

Understanding the Workspace Area.......................................................... 3-8

Configuration Dialogs............................................................................... 3-9

Main Configuration Dialog................................................................... 3-9

Instrument Configuration Dialog.......................................................... 3-9

Module Configuration Dialog............................................................... 3-10

Analog Channel Configuration Dialog ................................................. 3-10

DIO Configuration Dialog.................................................................... 3-10

Computed Channel Configuration Dialog ............................................ 3-10

Communication Dialogs............................................................................ 3-11

Main Communication Dialog ............................................................... 3-11

Instrument Communication and Status Dialog..................................... 3-11

Module Communication Dialog ........................................................... 3-11

Digital I/O Points Dialog...................................................................... 3-11

Computed Channels Dialog.................................................................. 3-11

Communications Icons.......................................................................... 3-12

Security Dialogs........................................................................................ 3-12

Trend Dialog ............................................................................................. 3-13

Alarm Dialog............................................................................................. 3-13

Mail and Web Settings Dialogs................................................................. 3-13

Managing Your Network Using Fluke DAQ................................................... 3-14

Inserting and Configuring an Instrument .................................................. 3-14

Inserting and Configuring a Module ......................................................... 3-19

Inserting and Configuring a Channel ........................................................ 3-23

Configuring a Computed Channel............................................................. 3-26

Configuring Multiple Channels................................................................. 3-29

Using Equations with Computed Channels............................................... 3-30

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Users Manual

Configuring Data Files.................................................................................... 3-46

Main Window Advanced Settings................................................................... 3-55

Using Fluke DAQ System Security Features.................................................. 3-56

Configuring Web and Alarm Mail Settings .................................................... 3-58

Starting a Scan .......................................................................................... 3-32

Starting a Configuration Scan .............................................................. 3-32

Starting an Instrument Scan.................................................................. 3-33

Getting Scan Data................................................................................. 3-33

Viewing and Resetting the Totalizer .................................................... 3-34

PC Card Functions.................................................................................... 3-34

Getting PC Card Information ............................................................... 3-34

Formatting the PC Card........................................................................ 3-34

Getting PC Card Scan Data.................................................................. 3-35

Starting Spy .............................................................................................. 3-36

Viewing Module Measurement Data........................................................ 3-38

Using the Digital I/O Points Communication Dialog............................... 3-39

Using Trend to View Collected Data........................................................ 3-40

Changing the Trend Chart Display....................................................... 3-43

Viewing Alarms........................................................................................ 3-44

Selecting a Master for a Data Group......................................................... 3-47

Advanced Data File Configuration........................................................... 3-47

Real-time Data File Creation .................................................................... 3-53

4 Maintenance ..................................................................................... 4-1

Introduction..................................................................................................... 4-3

Self-Test Diagnostics and Error Codes ........................................................... 4-3

Cleaning .......................................................................................................... 4-6

AC Fuse Replacement..................................................................................... 4-7

DC Fuse Replacement..................................................................................... 4-9

Performance Test............................................................................................. 4-9

Configuring the Performance Test Setup.................................................. 4-9

Initializing the Performance Test Setup.................................................... 4-11

Accuracy Performance Tests........................................................................... 4-13

Master Alarm Output Tests....................................................................... 4-14

RS-232 Master Alarm Output Test....................................................... 4-14

Fluke DAQ Master Alarm Output Test................................................ 4-14

Trigger Input Tests ................................................................................... 4-15

RS-232 Trigger Input Test.................................................................... 4-15

Fluke DAQ Trigger Input Test............................................................. 4-15

Trigger Output Tests................................................................................. 4-15

RS-232 Trigger Output Test................................................................. 4-15

Fluke DAQ Trigger Output Test .......................................................... 4-16

Volts DC Accuracy Test (PAI Module).................................................... 4-16

Volts DC Accuracy Test (FAI Module).................................................... 4-17

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Contents

(continued)

Volts AC Accuracy Test ........................................................................... 4-18

Frequency Accuracy Test.......................................................................... 4-19

Analog Channel Integrity Test .................................................................. 4-20

Open Thermocouple Response Test.......................................................... 4-20

2-Wire Resistance Accuracy Test (PAI) - Optional.................................. 4-21

2-Wire Resistance Accuracy Test (FAI Module) - Optional..................... 4-22

4-Wire Resistance Accuracy Test (PAI Module)...................................... 4-24

4-Wire Resistance Accuracy Test (FAI Module)...................................... 4-28

Digital Input/Output Tests......................................................................... 4-29

RS-232 Digital Input/Output Test......................................................... 4-29

Fluke DAQ Digital Input/Output Test .................................................. 4-30

DIO Relay/Fuse Tests ............................................................................... 4-30

RS-232 DIO Relay Fuse Test ............................................................... 4-30

Fluke DAQ DIO Relay Fuse Test......................................................... 4-30

Totalizer Tests........................................................................................... 4-31

RS-232 Totalizer Count Test ................................................................ 4-31

RS-232 Totalizer Count and Enable Test ............................................. 4-31

RS-232 Totalizer Count and Direction Test ......................................... 4-32

RS-232 Totalizer Count and Debounce Test ........................................ 4-32

Fluke DAQ Totalizer Count Test.......................................................... 4-33

Fluke DAQ Totalizer Count and Enable Test....................................... 4-33

Fluke DAQ Totalizer Count and Direction Test................................... 4-34

Fluke DAQ Totalizer Count and Debounce Test.................................. 4-34

Calibration ....................................................................................................... 4-35

Variations in the Display ................................................................................. 4-35

Service ............................................................................................................. 4-36

Replacement Parts ........................................................................................... 4-36

Appendices

A Specifications ............................................................................................ A-1

B Noise, Shielding, and Crosstalk Considerations ....................................... B-1

C True-RMS Measurements ......................................................................... C-1

D RTD Linearization..................................................................................... D-1

E Computed Channel Equations................................................................... E-1

F Data File Format........................................................................................ F-1

G Ethernet Cabling........................................................................................ G-1

H Network Considerations............................................................................ H-1

I Error Codes ............................................................................................... I-1

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2680A/2686A

Users Manual

Page 15

List of Tables

Table Title Page

1-1. Channel Count vs Scan Rate............................................................................ 1-16

1-2. Models, Options and Accessories.................................................................... 1-18

2-1. Front Panel Key Descriptions.......................................................................... 2-18

2-2. Annunciator Display Descriptions................................................................... 2-20

2-3. Instrument Default Parameters ........................................................................ 2-24

2-4. Displaying a Monitor Channel......................................................................... 2-25

2-5. Displaying the Digital I/O Status..................................................................... 2-27

2-6. Displaying Relay Status................................................................................... 2-28

2-7. Displaying Totalizer Status.............................................................................. 2-30

2-8. Reviewing and Setting the Base Channel Number.......................................... 2-31

2-9. Reviewing and Setting the Line Frequency..................................................... 2-33

2-10. Reviewing and Setting the Network Type....................................................... 2-35

2-11. Reviewing and Setting the Network Type to General ..................................... 2-37

2-12. Reviewing and Setting the General Network Socket Port ............................... 2-40

2-13. Reviewing and Setting the General Network IP Address................................ 2-41

2-14. Reviewing and Setting the Subnet Mask and Default Gateway ...................... 2-43

2-15. Viewing the Instrument Ethernet Address....................................................... 2-44

2-16. Identifying Network Problems......................................................................... 2-58

2-17. Ethernet Indicators........................................................................................... 2-61

3-2. Configuration Control States ........................................................................... 3-29

3-3. File Renaming Example................................................................................... 3-51

3-4. File Size Control Criteria................................................................................. 3-52

4-1. Self-Test Codes................................................................................................ 4-4

4-2. Recommended Test Equipment....................................................................... 4-10

4-3. Replacement Parts ........................................................................................... 4-36

A-1. 2680 Series General Specifications ................................................................. A-2

A-2. 2680A/2686A Clock and Calendar.................................................................. A-3

A-3. Trigger In Specification................................................................................... A-4

A-4. Trigger Out Specification ................................................................................ A-4

A-5. Master Alarm Output Specification................................................................. A-5

A-6. 2686A - Active Channels and Number of Scans to Card Capacity................. A-5

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Users Manual

A-7. PAI Module DC Voltage General Specifications............................................ A-6

A-8. PAI Module DC Voltage Range and Resolution Specifications..................... A-7

A-9. PAI Module DC Voltage Accuracy Specifications......................................... A-7

A-10. PAI Module AC Voltage General Specifications............................................ A-8

A-11. PAI Module AC Voltage Range and Resolution Specifications..................... A-9

A-12. PAI Module AC Voltage Accuracy Specifications......................................... A-10

A-13. PAI Module 4-Wire Resistance Temperature Coefficient .............................. A-11

A-14. PAI Module 4-Wire Resistance Range and Resolution Specifications........... A-11

A-15. PAI Module 4-Wire Resistance Accuracy Specifications............................... A-12

A-16. PAI Module 4-Wire RTD Temperature Coefficient ....................................... A-13

A-17. PAI Module 4-Wire RTD Specifications ........................................................ A-13

A-18. PAI Module Thermocouple General Specifications........................................ A-14

A-19. PAI Module Thermocouple Specifications ..................................................... A-15

A-20. PAI Module Frequency Accuracy Specifications ........................................... A-17

A-21. PAI Module Frequency Sensitivity Specifications.......................................... A-17

A-22. FAI Module DC Voltage General Specifications............................................ A-18

A-23. FAI Module DC Voltage Resolution and Repeatability Specifications.......... A-19

A-24. FAI Module DC Voltage Accuracy Specifications......................................... A-19

A-25. FAI Module AC Voltage General Specifications............................................ A-20

A-26. FAI Module AC Voltage Range and Resolution Specifications..................... A-20

A-27. FAI Module AC Voltage Accuracy Specifications......................................... A-21

A-28. FAI Module 4-Wire Resistance Temperature Coefficient .............................. A-22

A-29. FAI Module 4r-Wire Resistance Range and Resolution Specifications.......... A-22

A-30. FAI Module 4-Wire Resistance Accuracy Specifications............................... A-23

A-31. FAI Module 4-Wire RTD Temperature Coefficient ....................................... A-23

A-32. FAI Module 4-Wire RTD Specifications ........................................................ A-24

A-33. FAI Module Thermocouple General Specifications........................................ A-24

A-35. FAI Module Frequency Accuracy Specifications ........................................... A-27

A-36. FAI Module Frequency Sensitivity Specifications.......................................... A-27

A-37. DIGITAL I/O Specification ............................................................................ A-28

A-38. Totalizer Specification .................................................................................... A-29

A-39. DIGITAL I/O Relay Specification.................................................................. A-29

B-1. FAI Module Crosstalk Specifications. ............................................................ B-3

B-2. PAI Module Crosstalk Specifications ............................................................. B-4

I-1. Error Codes ..................................................................................................... I-1

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Page 17

List of Figures

Figure Title Page

1-1. 2680A/2686A Instrument ................................................................................ 1-4

1-2. 2680A/2686A Front Panel............................................................................... 1-5

1-3. Typical Front Panel Display During Scanning and Monitoring...................... 1-6

1-4. 2680A/2686A Rear Panel ................................................................................ 1-7

1-5. DIO Connector Module ................................................................................... 1-13

2-1. Instrument Preparation..................................................................................... 2-4

2-2. Connecting the Instrument to a Power Source................................................. 2-6

2-3. Alarm/Trigger I/O Connector.......................................................................... 2-9

2-4. External Trigger Wiring for a Group of Instruments....................................... 2-11

2-5. Universal Input Module Connections .............................................................. 2-13

2-6. 2-Wire and 4-Wire Connections..................................................................... 2-14

2-7. Digital I/O Connector ...................................................................................... 2-16

2-8. Front Panel Controls ........................................................................................ 2-17

2-9. Front Panel Indicators...................................................................................... 2-19

2-10. Rear Panel Controls ......................................................................................... 2-22

2-11. Displaying a Monitor Channel......................................................................... 2-26

2-12. Examples During Monitor ............................................................................... 2-26

2-13. Examples for Digital I/O, Relay, and Totalizer Status .................................... 2-29

2-13. Reviewing and Setting the Base Channel Number.......................................... 2-32

2-14. Examples for Reviewing and Setting the BCN................................................ 2-32

2-14. Reviewing and Setting the Line Frequency..................................................... 2-34

2-15. Examples for Reviewing and Setting the Line Frequency............................... 2-34

2-15. Reviewing and Setting the Isolated Network Type to Isolated........................ 2-36

2-16. Examples for Reviewing and Setting the Network Type................................. 2-36

2-17. Examples for Reviewing and Setting General Network Parameters ............... 2-38

2-17. Viewing the Instrument Ethernet Address....................................................... 2-45

2-18. Examples for Viewing the Ethernet Address................................................... 2-45

2-19. Preparing for Network Operation .................................................................... 2-48

2-20. Host Computer/Instrument Direct Connection ................................................ 2-49

2-21. Interconnection Using 10/100BaseT (Twisted Pair) Wiring ........................... 2-51

4-1. Replacing the Fuse........................................................................................... 4-8

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Users Manual

4-2. Performance Test Setup .................................................................................. 4-11

4-3. 2-Wire Connections to 5700A......................................................................... 4-24

4-4. 4-Wire Connections to the Universal Input Module (Resistor)....................... 4-25

4-5. 4-Wire Connections to the Universal Input Module (5700A)......................... 4-26

A-1. 2680 Series Chassis......................................................................................... A-30

C-1. Comparison of Common Waveforms.............................................................. C-3

D-1. 385 RTD.......................................................................................................... D-2

D-2. 375 RTD.......................................................................................................... D-3

D-3. 391 RTD.......................................................................................................... D-4

D-4. 392 RTD.......................................................................................................... D-6

G-1. 10/100BaseT Ethernet Cables ......................................................................... G-2

Page 19

Chapter 1

Overview

Introduction 1-3

Contacting Fluke ............................................................................................. 1-3

Instrument Features and Capabilities .............................................................. 1-5

Mainframe Features.................................................................................. 1-8

Trigger Input......................................................................................... 1-8

Trigger Output...................................................................................... 1-8

PC Card ATA Interface (2686A Only)................................................. 1-8

Master Alarm........................................................................................ 1-9

Interval Trigger..................................................................................... 1-9

External Trigger.................................................................................... 1-9

Alarms .................................................................................................. 1-9

Channel Monitoring.............................................................................. 1-10

Alarm Trigger....................................................................................... 1-10

Channel Numbering.................................................................................. 1-10

Computed Channels.................................................................................. 1-11

Mx+B Scaling........................................................................................... 1-11

Analog Channels....................................................................................... 1-11

Digital I/O Module Option........................................................................ 1-12

Digital I/O............................................................................................. 1-12

Relay Output......................................................................................... 1-12

Totalizer................................................................................................ 1-12

User Interface .................................................................................................. 1-13

Operating a 2680 Series Data Acquisition System.......................................... 1-14

Isolated Networks ..................................................................................... 1-14

General Networks ..................................................................................... 1-14

Ethernet Port ............................................................................................. 1-14

Group Operations...................................................................................... 1-15

Scanning and Logging .............................................................................. 1-15

RS-232 Interface....................................................................................... 1-17

Host Computer Requirements ......................................................................... 1-17

Options and Accessories ................................................................................. 1-18

Contents Page

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2680A/2686A

Users Manual

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Page 21

Introduction

The 2680A Data Acquisition System (DAS) and 2686A Data Logging System (DLS) provide 20 to 120 channels that operate in conjunction with Fluke DAQ software for Windows to form a data acquisition system.

The 2686A comes with a removable PC Card (PCMCIA) for stand-alone storage operation. This socket accepts ATA memory cards up to 2 GB in size.

Each 2680 Series instrument can hold from 1 to 6 modules. These modules are the Precision Analog module (PAI), Fast Analog module (FAI), and the Digital IO/Relay and Totalizer module (DIO). These modules are all isolated from one another. You can add the DIO module to the instrument in slot 6 only.

The analog modules measure dc volts, ac volts, ohms, temperature, frequency, and dc current. Temperature measurements use thermocouples, thermistors or resistance temperature detectors (RTDs). The instruments also have extensive computed math capability. Besides using data collected from the analog modules and digital totalizer, time can also be used in computed channel calculations.

The system scans 20 to 120 analog channels and calculates the values for up to 60 computed channels. Interval timers, alarm conditions, and/or an external signal input can trigger scans. The Fluke DAQ software configures and controls up to 99 2680 Series instruments via an Ethernet connection. The software provides the means to view scan data and log it into files. In addition, Fluke DAQ software permits multiple master/slave groups to run simultaneously.

Overview

Introduction

The two analog modules that may be used with the 2680 Series are the FAI module and the PAI module. The PAI modules emphasize precision with 5 ½ digits of resolution, .02% accuracy, and can withstand up to 150 V common mode voltage (300 V on channels 1 and 11). The FAI modules emphasize increased measurement speed with 4 ½ digits of resolution, 0.04% accuracy, and can withstand up to 50 V common mode voltage. See Appendix A for instrument specifications.

Contacting Fluke

To contact Fluke, call one of the following telephone numbers:

USA: 1-888-99-FLUKE (1-888-993-5853) Canada: 1-800-36-FLUKE (1-800-363-5853) Europe: +31 402-675-200 Japan: +81-3-3434-0181 Singapore: +65-738-5655 Anywhere in the world: +1-425-446-5500

Or, visit Fluke's Web site at www.fluke.com

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2680A/2686A

Users Manual

2680 SERIES DAQ SYSTEM

REVIEW

MAX

REM

LAST

SCAN

MIN

AUTO

SET

FUNC

MON

Mx+B

ALARM

C F RO

mV AC DC

LIMIT

x1Mk

OFF

PRN

CAL

EXT

Figure 1-1. 2680A/2686A Instrument

alg46f.eps

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Page 23

Instrument Features and Capabilities

Instrument Features and Ca pabilities

The following describes the front and rear panels of the instrument and its capabilities (Figures 1-2 to 1-4).

Overview

Primary, Secondary, and Annunciator Displays.

Indicators and annunciators for operating mode, configuration, display, and data measurements.

2686A DATA ACQUISITION SYSTEM

FUNC

SET

MAX

REM

SCAN

REVIEW

MIN

LAST

Function Keys. User keys for configuring

ALARM

Mx+B

AUTO

MON

C F RO

mV AC DC

LIMIT

x1Mk

operating parameters such as Base Channel Number, and front panel displays such as channel monitoring, digital I/O status, and totalizer count.

Status Indicator (LED)

PRN

OFF

EXTCHTR

CAL

Eject Button

PC Card Slot

(Only available on the 2686A)

LIMIT

HI LO

OFF CAL

PRN EXTCHTR

REVIEW

LAST

MAX

MIN

REM

AUTO

SCAN

MON

SET

Mx+B

FUNC ALARM

C F RO

mV AC DC

x1Mk

Display detail

alg47f.eps

Figure 1-2. 2680A/2686A Front Panel

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2680A/2686A

Users Manual

REM (Remote) Annunciator.

Indicates the Host Computer and the Instrument are communicating on the network, i.e., the instrument is being operated remotely.

SCAN (Scanning) Annunciator.

Indicates the instrument is scanning.

MON (Monitor) Annunciator.

Indicates the instrument is monitoring a channel (in this example, analog channel 208). You can monitor a channel with or without instrument scanning.

11208 (Global ChannelNumber).

Indicates the channel being monitored is

11208. This number consists of the instrument Base Channel Number (11), Module Number (2) and the selected channel (08).

1-6

m Annunciator. Indicates the multiplier for the reading is .001 (milli). The other multipliers are k (kilo,

1000), and M (mega, 1,000,000).

14.721 (Reading). Indicates the reading of the channel being monitored has a value of 14.721.

V DC (Volts DC) Annunciator.

Indicates that the number shown in the primary display (14.721) is the function volts dc.

Figure 1-3. Typical Front Panel Display During Scanning and Monitoring

CH (Channel) Annunciator.

Indicates the number shown in the secondary display (11208) is the Global Channel Number.

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Page 25

Instrument Features and Capabilities

Overview

Ethernet 10/100BaseT Connector.

A RJ-45 connector that interfaces the instrument with a 10/100BaseT Twisted Pair Ethernet network. The instrument automatically detects 10 or 100BaseT operation.

Power Switch.

Supplies power to the

instrument (ac or dc

operation).

Ground Terminal.

Connect to earth

ground when using

DC power.

Fuse Compartment

MODEL

2680A 2686A

FLUKE CORPORATION MADE IN USA www.fluke.com

PATENTS PENDING

STANDBY

CAUTION:

FOR FIRE PROTECTION

REPLACE ONLY WITH

A 250V FUSE OF

INDICATED RATING

CHASSIS GROUND

FUSE

T1/2A 250V

WARNING:

TO AVOID ELECTRIC SHOCK GROUNDING CONNECTOR IN POWER CORD MUST BE CONNECTED

NO INTERNAL USER SERVICEABLE PARTS. REFER SERVICE TO QUALIFIED SERVICE PERSONNEL

AC Power Connector. Connects to any line source of 100 to 240 V ac (50/60 Hz).

SLOT CONFIGURATION

3456

SERIAL NUMBER

XMT

RCV

10/100 BASE T

ETHERNET

NOT FOR

CONNECTION

TO PUBLIC

TELEPHONE

SYSTEM

LINK

RS-232 SERIAL

PORT

(SB)

MAIN SUPPLY

100V- 240V 47Hz / 63Hz 100VA MAX

Ethernet Indicators.

XMT (transmit) blinks red for instrument Ethernet transmissions.

RCV (receive) blinks red for any Ethernet activity on the network.

LNK (link) lights red if 10BaseT is operating, green if 100BaseT is operating.

RS232

Serial Port (for service use)

ALARM/TRIGGER I/O Connector.

Master Alarm output is logic low when any channel is in alarm; Trigger Out output is logic low for nominal 125 ms start of any scan; Trigger In input logic low triggers scanning; DC PWR (dc volts input) input is 9 to 45 V dc to power the instrument.

alg60f.eps

Figure 1-4. 2680A/2686A Rear Panel

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Mainframe Features

Trigger Input

Trigger Input is an instrument connection used to trigger scans from an external source. The connection uses the rear panel Trigger In and GND (Figure 1-4). A logic low or contact closure between Trigger In and GND triggers an instrument scan if External Trigger is enabled. While the trigger input line is held low, the instrument continues to scan at Interval 2.

When there is no trigger input, an internal pull-up resistor holds the input at logic high (nominal +5.0 V dc).

Trigger Output

Trigger Output is an output line that, when enabled, goes to logic low for 125 µs every time a scan begins. The connection uses the rear panel Trigger Out and GND (Figure 1-4). Use the Trigger Output to trigger other instruments by their Trigger Input connection and to interface with external equipment. An internal pull-up resistor holds the trigger output line at a logic high (nominal +5.0 V dc) when there is no trigger output.

PC Card ATA Interface (2686A Only)

A PC ATA card interface provided in each 2686A system. It can be used to store data when there is no network connection. The data produced is DOS compatible. When scanned data is first recorded on the card, a copy of the configuration of the instrument is also recorded. As a result, you can stop scanning, remove the card, read results, reinstall the card in the same instrument, and restart scanning and have only one file created. If you want to clear the existing memory card, the front panel keys can be used to erase the card contents. You can use up to 2 GB ATA compatible PC Card in a 2686A instrument. See Chapter 2 for additional information.

1-8

An error will result if a card has partially been filled with data from a different configuration. This can be fixed by using the front panel keys to erase the existing data in the card.

XWCaution

Removing the PC card while the storage LED is on may cause a loss of data. Before removing the card, stop the instrument scanning. Loss of power while data is being written to the card may also result in loss of data.

Page 27

Master Alarm

Master Alarm is an instrument output line that is logic low (nominal +0.8 V dc) for as long as any channel is in alarm while scanning is active. The connection uses the ALARM/TRIGGER I/O terminals Master Alarm and GND (Figure 1-4). This TTL output interfaces with external equipment such as warning lights, alarms, automatic shutdowns, and paging systems. When the alarm condition ends or scanning stops, an internal pull-up resistor sets the output at logic high (nominal +5.0 V dc).

Interval Trigger

Interval Trigger is an internal software timer you can set using Fluke DAQ software. It permits scanning at regular time intervals using Interval 1. Interval 1 is in seconds, with a minimum of 0.000 (continuous scanning) and a maximum of

86400.000 (one scan every 24 hours). The time resolution is to the millisecond, for example, 12.345 seconds.

External Trigger

External Trigger is started by an external event and triggers scanning when an external logic low is applied to the instrument Trigger In line. As long as the Trigger Input remains low, scans are triggered at regular time intervals using Interval 2. Interval 2 is in seconds, with a minimum of 0.000 (continuous scanning) and a maximum of 86400.000 (one scan every 24 hours). The time resolution is to the millisecond, for example, 12.345 seconds. When scanning starts, if the External Trigger is logic low, scanning begins at the Interval 2 rate. If the External Trigger is logic high, no scans are triggered until the trigger line is set to logic low.

Overview

Instrument Features and Capabilities

If one or more external trigger events occur while a scan is in progress, one triggered scan follows the scan in progress.

Alarms

Two alarms, Alarm 1 and Alarm 2, can be applied to any configured channel. An alarm condition occurs when a measurement falls below a low alarm value, rises above a high alarm value, or is between the two alarm values. If you apply Mx+B scaling as part of the channel configuration, the instrument bases the alarms on the scaled values.

When any configured channel is in alarm, the Alarm annunciator is on dim, or bright if a channel in alarm is being used as an Alarm Trigger. When a channel is in alarm, the rear-panel Master Alarm output is asserted (logic low). You can use alarms to trigger scanning (see Alarm Trigger later in this chapter) and to set a Digital I/O line to a logic low (see Digital I/O Module later in this chapter) or close a relay. The Fluke DAQ software displays and records alarm conditions.

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Users Manual

Channel Monitoring

Channel monitoring takes place at the front panel of the instrument. Use the front panel MON key and arrow keys to select a channel for monitoring. The Fluke DAQ software also allows the selection of a channel to monitor during scanning. For an example of a front panel display of the instrument during monitoring, see Figure 1-3. Monitor can also automatically scroll up or down through the channels displaying each channel and then moving to the next. The channel monitoring display nominally updates once per second.

Alarm Trigger

The alarm trigger triggers scanning when a channel designated as an alarm trigger goes into alarm. As long as any such channel is in alarm, scans are triggered at regular time intervals using Interval 2. Interval 2 is in seconds, with a minimum of

0.000 (continuous scanning) and a maximum of 86400.000 (one scan every 24 hours). The time resolution is to the millisecond, for example, 12.345 seconds.

The instrument performs background monitoring of channels designated as alarm triggers to check for alarm conditions using Interval 3.

You can combine Alarm Trigger with External Trigger and Interval Trigger. For example, set the Interval Trigger for 60 seconds (Interval 1) and the Alarm Trigger for 10 seconds (Interval 2). Scanning is at 60 second intervals except when a channel designated as an alarm trigger is in alarm, when scanning is at 10 second intervals.

Channel Numbering

Each instrument channel, measured or computed, is identified by the Global Channel Number (GCN). The first two digits of the GCN are the Base Channel Number (01 to 99) that identifies the instrument. The third digit indicates the slot or module number. The last two digits are the channel number. For example, GCN 28318 indicates instrument 28 , slot 3, and channel 18. When the instrument is in the quiescent state, the channel number of the GCN shows dashes, for example, 45--- for instrument 45.

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Computed Channels

In addition to the analog channels, the instrument provides an additional 60 computed channels by processing analog channels and other computed channels.

The computed channels are numbered 901 to 960. The following calculations are used:

• The average of a group of channels,

• The difference between any two channels,

• The difference between a channel and the average of a group of channels,

• A mathematical equation. Other channels, time and totalizer can be part of the

equation.

For computed channels, the functions use 24 bits and an exponent for calculations. As a result, when the totalizer or time exceed 16,777,215 units, the number will be rounded off to remain within the 24 bits. For example, one count more than 16,777,215 would be rounded to 16,777,220 in a computed channel.

Mx+B Scaling

Mx+B scaling multiplies a measurement by a multiplier M and then offsets it by an offset B. For example, Mx+B scaling of 100x+50 applied to a measured or computed channel value of 1.15 results in a reading of 100(1.15)+50=165. A common use of Mx+B scaling is to scale a sensor or transducer to provide for display and recording in engineering units. The Mx+B annunciator lights when a monitored channel has scaling applied.

Overview

Instrument Features and Capabilities

Analog Channels

The analog channel measurement connections are made via the Universal Input Modules. External signal conditioning for the analog inputs is not necessary for most common electrical signals. The input channels are numbered 101 to 120, 201 to 220, 301 to 320, 401 to 420, 501 to 520, and 601 to 620. The host computer configures all analog channels using the Fluke DAQ software.

There are two different analog modules available for the 2680 Series instruments with up to 6 modules for any given instrument. Each module is isolated from every other module to 300 V. One analog module is the fast analog module (FAI) and has a maximum rate of 667 channel readings per second but a limited input voltage of 50 V dc or 30 V rms. The other analog module is the precision analog module (PAI). The PAI has a maximum of 300 V dc rms (on channel 1 and 11) and a maximum rate of 133 channel readings per second. All other channels are 150 V maximum for the PAI module. The Digital IO/Relay and Totalizer module can monitor digital type (High or Low) signals.

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Users Manual

Digital I/O Module Option

Digital I/O

20 general-purpose open collector digital outputs and Transistor Logic (TTL) digital input lines are available in the Digital I/O module. A logic low can be applied to an I/O line as an input; alternatively a logic low can be internally set by the instrument if the channel is set as an output. If no logic low is set or applied externally, the input is pulled up to logic high (+5 V) internally. An output logic low condition takes precedence over an input logic high condition. When the I/O lines are used as inputs, they signal an external condition that can be correlated to the data measurements.

Fluke DAQ software records the status of the Digital I/O as the decimal equivalent of the 20 binary bits. For example, 1111 1111 1111 1111 1111 (DIO19 to DIO0) is represented by decimal 1,048,575; 0000 0000 0000 0000 1111 is represented by decimal 15.

The instrument can display the Digital I/O status in binary format at the front panel with updates each second.

Relay Output

There are also 8 relays capable of switching up to 1 A or 250 V rms. Fluke DAQ software records the relay status as bits 24-31 of the DIO value. The selay status can also be displayed on the instrument front panel.

1-12

Totalizer

The Digital I/O module also includes a totalizer with external enable. The totalizer input counts contact closures or voltage transitions with a maximum count of 4,294,967,295. There is also an external totalizer enable that can be used to enable the totalizer. The totalizer can be preset and count down to zero or count up from zero.

The connections for the totalizer are the Σ and Σen input lines on the Digital I/O connector (Figure 1-5). The instrument continuously detects the totalizer input on the rear panel independently from instrument scanning and other activities. If the Totalizer overflows (reaching the maximum count), the display briefly shows OL (overload) and begins counting again.

Page 31

Overview

User Interface

A totalizer input from contact closures increments on the “open” portion of the switch sequence close-open. To prevent switch contact “bounce” from triggering false readings, select the Totalizer Debounce feature. A totalizer input from voltage transitions increments during low-to-high voltage transitions with a nominal threshold of +1.4 V. The maximum voltage input is +30 V dc, and the minimum voltage input is -4.0 V dc. The maximum totalizer rate is 5,000 transitions per second without debounce and 500 transitions per second with debounce.

The instrument reports totalizer status with scan data and can display it at the front panel. You can initialize the totalizer count by cycling power to the instrument or using Fluke DAQ software.

User Interface

Fluke DAQ is the operating software for the 2680 Series instruments. It lets you configure and operate your system through a Windows-based environment. You can install Fluke DAQ on either Windows XP, 2000 (Service Pack 3 required), or NT (Service Pack 6.0 required). Chapter 3 of this manual provides detailed information about using Fluke DAQ software.

K3A K3B

K6A K6B

RELAY

DIAGRAM

RELAYS DIGITAL I/O

K2A K2B K1A K1B

K5A K5B K4A K4B

K8BBK7A K7B

K8A

Figure 1-5. DIO Connector Module

DIO 0-7

DIO 8-15

DIO 16-19

-4V +30V

MAX

alg57f.eps

You can use Fluke DAQ software to easily perform the following:

• Configure your 2680 Series network and instrument settings.

• Download/upload configuration to the instruments.

• Send commands to the digital I/O.

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Users Manual

• Monitor the instruments on-line values and alarms.

• Plot trend charts, retrieve historical trends, acknowledge alarms, and export

data files in .csv format.

Note

Fluke DAQ supports the NetDAQ 2680 models (2640A and 2645A) as well as the 2680A and 2686A.

Operating a 2680 Series Data Acquisition Sy stem

You can configure 2680 Series instruments to operate over either an isolated or general network. An isolated network includes 2680 Series instruments and a host computer only. A general network may also include servers, routers, gateways, or other network devices. Both types of networks interconnect using Ethernet (i.e., using the IEEE 802.3 or ISO 8802-3 standards).

A unique 2 digit Base Channel Number (BCN) entered at the instrument front panel identifies each 2680 Series instrument on the network. All subsequent operations refer to the instrument by BCN. Fluke DAQ supports up to 99 instruments for operation. You cannot operate an instrument from more than one host computer at a time.

Isolated Networks

An isolated network consists of only 2680 Series instruments and host computer. The advantages include simplified setup, faster network operation, and freedom from general network problems. Data throughput specifications are guaranteed only for isolated networks. When you set Fluke DAQ software for an isolated network, it automatically handles instrument IP addressing. You must configure your host computer networking software to use a host computer IP address of

198.178.246.101 and subnet mask of 255.255.255.0. See Setting Host Computer Network Parameters in Chapter 2 of this manual.

General Networks

A general network consists of host computers, 2680 Series instruments, and servers, routers, gateways, or other network devices. Refer connectivity issues to your network administrator and review Network Considerations in Appendix H for more information. When you install the software for a general network, you must enter the instrument IP addresses manually. For more information, see Reviewing and Setting the Network Type in Chapter 2.

Ethernet Port

Each 2680 Series instrument has a 10/100BaseT twisted pair Ethernet network port. The instrument automatically monitors the Ethernet port.

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Page 33

Group Operations

Using Fluke DAQ, you can group scan data from multiple instrument modules and sources. Fluke DAQ can record data from all sources in the group into a single .csv data file.

When grouping data, one module or instrument is designated as the Master. The Master determines the times of the scans in the .csv data file. Scan data can be grouped while scanning, or after scanning has ended using the Export feature.

Scanning and Logging

When a scan is triggered, the instrument scans the 20-120 analog channels, scans the Digital I/O channels and totalizer and calculates the 60 computed channels. It stores the resulting time-stamped data in a scan record. Scans can be triggered from several sources:

• Interval Trigger, where an elapsed interval timer triggers a scan.

• External Trigger, where an external input (ground or logic low) applied to the

instrument, the Trigger In signal triggers a scan.

• Alarm Trigger, where a channel going into alarm starts a scan.

Fluke DAQ software obtains scan records from the instruments and logs the data into a history database and optionally into a .csv file. Each scan record consists of a timestamp, values from all configured and recording analog channels and computed channels, and the alarm states, plus the Digital I/O line status and the count of the totalizer if the Digital I/O Relay module is in the instrument.

Overview

Operating a 2680 Series Data Acquisition System

A number of factors can affect the actual scan rate in the 2680A/2686A instruments. These include:

• The number of active modules

• The number of active channels

• Use of the DIO for alarms or as a totalizer/counter

• Writing to a PC card

• Network data rates.

There is a 2.6 ms overhead associated with accessing each module in a instrument. There is overhead associated with reading each channel. For an FAI module, it is about 1.4 ms per channel. Consequently, including the module overhead, when reading one FAI with 20 active channels, you can get the scanned data in 30 ms or 667 channels per second. If you read only one channel, it takes 4 ms for a rate of only 250 channels per second. For high-speed measurements, it is faster to use fewer channels on each module. However, when a single channel and minimum scan interval are used on four or more FAIs, the internal program may not keep up with the scan data rate and some data could be lost.

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The internal evaluation algorithm allows data from slower modules to be recorded regardless of the scan speed of other modules. The measurements made by slower PAIs well still be recorded even when running in a chassis of FAIs. Only the fastest modules may experience some loss of data. If the user sets the interval time of each module to 31 ms or greater, no data will be lost for any number of FAI channels. In addition, if the total number of scans for all of the modules combined is less than 1000 scans per second, there should be no problem with losing scans. Below is a table showing the timing.

Using the DIO for alarms or the totalizer will slow system throughput because of its 4 ms overhead. DIO data is provided with each module scan. Consequently, having five modules scanning at the same speed will incur an additional 20 ms delay if a DIO is active.

Writing to the PC card is more time consuming than writing to internal memory. This is partly because the 2686A instrument uses a DOS compatible file storage system that requires additional overhead. As a result, the maximum scan time while storing data will be slowed.

Table 1-1. Channel Count vs Scan Rate

2680A/2686A Channel Rate With No Lost Data*

Channel Count Module Count Typical Total Time (ms) Typical Scan Rate (ch/s)

1 1 4 250 1 2 4 500 1 3 4 750 1 4 4 1,000 1 5 5 1,000

1 6 6 1,000 20 1 30 666 40 2 30.1 1,329 60 3 30.1 1,993 80 4 30.1 2,658

100 5 30.1 3,322 120 6 30.1 3,990

* Assumes no DIO, no PC card storage, no network communication, and only FAI modules in the chassis.

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Page 35

Network traffic can have a significant impact on instrument throughput. More importantly, if the 2680 Series instruments cannot output the readings quickly enough, the internal memory will eventually over flow. Depending on the setting the user chose, the readings will either be written to the last location in memory or start to write over the oldest data location (the default). In either case, data can be lost.

The internal buffer memory can store up 30,000 scans. A scan can contain up to 20 channels from one module plus up to 60 computed channels. At the fastest measurement rates, 6 FAI modules could fill up the internal memory in about 150 seconds. Once the internal memory is full, data will be lost.

RS-232 Interface

The instruments include an RS-232 port for calibration, servicing, and factory procedures; the RS-232 port is not used for instrument control or scan data collection. See Calibration in Chapter 4 of this manual.

Host Computer Requirements

The host computer used for instrument operations must meet the following minimum requirements:

Overview

Host Computer Requirements

• PC with a 200 MHz microprocessor or greater, running Windows XP, 2000

(Service Pack 3 required), or NT (Service Pack 6.0 required)

• Color VGA Monitor

• 200 MB of free disk space

• CD ROM drive

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2680A/2686A

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Options and Accessories

Table 1-2 summarizes the available models, options and accessories.

Table 1-2. Models, Options and Accessories

Model Description

2680A-FAI Fast Analog Input Module

2680A-PAI Precision Analog Input Module 2680A-DIO Digital I/O Relay with Totalizer Module 2680A-102 Extra Digital Connector Module 2680A-180 Extra Input Module for analog input procedures 2680A-800 16 MB Memory Card 2680A-801 128 MB Memory Card 2680A-802 256 MB Memory Card 2680A-805 512 MB Memory Card 2680A-810 1 GB Memory Card

1-18

2680A-BLANK Blank Module

2680A-APSW Fluke DAQ Software. Included with the purchase of each chassis.

2680A-DEVSW Fluke Development Software

2680A-DLL Fluke DLL Library routines for the development of custom user software.

2680A-OPC Fluke OPC Software. Used to configure a PC to act as an OPC server

and provide virtual contact with a 2680 Series instrument.

Page 37

Chapter 2

Preparing for Operation

Introduction 2-3

Instrument Preparation..................................................................................... 2-4

Unpacking and Inspecting the Instrument................................................. 2-5

Positioning and Rack Mounting................................................................ 2-5

Connecting to a Power Source and Grounding ......................................... 2-5

Operating Using AC Power .................................................................. 2-6

Operating Using DC Power .................................................................. 2-7

Grounding and Common Mode Voltage............................................... 2-7

Alarm/Trigger I/O Connection.................................................................. 2-7

Trigger Input......................................................................................... 2-8

Trigger Output ...................................................................................... 2-9

Master Alarm ........................................................................................ 2-10

External Trigger Wiring for a Group ........................................................ 2-10

Universal Input Module Analog Connections (2620A-180) ..................... 2-12

Shielded Wiring .................................................................................... 2-15

Crosstalk Considerations ...................................................................... 2-15

Digital I/O Connector Module. ................................................................. 2-15

Digital I/O............................................................................................. 2-16

Totalizer................................................................................................ 2-16

Totalizer Enable.................................................................................... 2-17

Relays.................................................................................................... 2-17

Controls and Indicators ............................................................................. 2-17

Front Panel Controls ............................................................................. 2-17

Front Panel Indicators........................................................................... 2-19

Rear Panel Controls .............................................................................. 2-22

Rear Panel Indicators............................................................................ 2-23

Front Panel Operating Procedures............................................................. 2-24

Power-On Options ................................................................................ 2-24

Displaying a Monitor Channel.............................................................. 2-25

Displaying the Digital I/O Status.......................................................... 2-27

Displaying Relay Status........................................................................ 2-28

Displaying the Totalizer Status............................................................. 2-30

Contents Page

2-1

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